In just four hours since it was posted, the letter has been shared more than 600,000 times -- and that's just on Facebook. Twitter is also singing his praises, as Stanton's powerful words began trending on the social media site shortly thereafter.

Thank you Brandon Stanton of HONY! This is, by far, the best response I've seen to Donald Trump. https://t.co/O0P8Yhn8KT